After this the aria "Et in spiritum sanctum," in which the next dogmatic clauses are enshrined like relics in a casket, furnishes a beautiful decorative design on which the listener can repose his mind; and then comes the voluminous ecclesiastical fugue, Confiteor unum baptisma, leading, as through the door and world-wide spaces of the Catholic Church, to that veil which is not all darkness to the eye of faith.